基于ALE的降落伞充气过程数值仿真

Numerical Simulation of Parachute Inflation Process Based on ALE

采用任意拉格朗日-欧拉法(Arbitrary Lagrange Euler method,ALEM)流固耦合方法模拟某模型伞在低速气流作用下充气展开过程。计算获得了充气过程中伞衣应力、流场速度矢量、压力以及伞衣半径变化等结果。与试验对比,开伞过程相同,同样出现了伞衣顶部塌陷、抖动等现象。通过对数值结果的分析解释了伞衣抖动以及风洞试验中伞底拍动产生巨大噪声的原因,同时预测开伞过程中的危险截面。

The parachute opening process in low-speed airflow is simulated based on ALE method. The numerical results of the structural stress, the velocity vector, the pressure contour of flow field, the diameter change of canopy and so on are obtained. Compared with the test, the opening processes are the same, and the phenomenas of top sink and canopy shake are observed. Finally, the mechanical mechanism explanation of canopy shake and the huge noise caused by canopy flapping in tests, and the prediction of dangerous section during opening are given by the analysis based on numerical results.